David Johnston is speaking out one week after the horrific tragedy

It was a horrific incident in Gibsonia February 19th, when police say a grandson heard voices from an Arch Angel, and then stabbed and killed his grandmother. Now his grandfather is speaking out, working with local legislators on changing mental health laws in this state.

“We’re doing better than you’d expect, because we have faith in the Lord Jesus Christ, we know she’s in Heaven and we just move on with life, we cry and keep going,” said David Johnston.

David Johnston is remarkably composed just one week after his wife, Constance, was allegedly stabbed by their grandson in the home they shared.

As Constance sat in the kitchen, police say 26 year old Levi Staver claims that voices from an Arch Angel told him his grandmother was a witch, and so he allegedly walked up behind her, and stabbed her.

Johnston says his grandson grew up with a bright future ahead… but that in his teenage years, mental health problems intensified, followed by the diagnosed schizophrenia.

“There are many families who are living the same nightmare,” said Johnston.

Johnston says he’s sitting down with state representative Mike Turzai to discuss new or altered laws that’d make it easier for the mentally ill to get help.

“The law defines these things in a way that the mental health people will tell you it doesn’t meet the mental criteria, that we can’t do anything,” said Johnston. “If we can stop people from killing their mothers and grandmothers, then we can stop the mass murders because so many people kill their families before they kill somebody else.”

Information from a previous article is below:

Allegheny County homicide detectives have charged a young man with fatally stabbing his grandmother inside her Richland Township home.

"The actor's grandma and grandfather were sitting at the kitchen table eating breakfast, he came up from the downstairs area of the home and walked up behind the grandmother and stabbed her in the back while she was eating," Northern Regional Police Chief Robert Amman said.

The victim was identified as Constance Johnston, 76. Amman said that the suspect, Levi Staver, 26, was waiting outside the home on Gibsonia Road (Route 910) when officers arrived.

"They took him into custody at that time. One of the officers went into the house and found the victim laying on the living room floor with a stab wound to the back," Amman said.

According to the criminal complaint, Staver told county police that he was sitting at his computer when "the Arch Angel" told him to "kill the witch." They said the family previously had serious concerns about his mental health.

"If the Arch Angel tells me to do something, I just do it," Staver explained to police, according to the complaint.

Constance Johnston's husband, David Johnston, is a pastor in their community. "It is with great sadness that we learned of the tragic death of Constance Johnston, our Pastor David Johnston's wife," said a statement from Lifeline Community Church in Richland. "Connie was not only a member of our church family, but a guiding hand to our congregation. She inspired so many people with her kind demeanor, ability to listen and helped those she met. She was more than the pastor's wife; she was a close and admired friend to all of us. During this time of sadness we respectfully ask for privacy and prayers as we grieve, cope and ask for God's peace and mercy in the midst of this tragedy."

Staver is being held in the Allegheny County Jail on a homicide charge.